Pulverizing mill



Jul 1 1924'. 1,4995% (5. H. FRASER PUlJVERIZING MILL Original Filed April 30 1918 3 Sheets-Sheet l b 1 9 9 1 R E s A R F H G Jung! 1 19240 PULIVERIZING MILL inal Filed April 30. 1918 s Sheets-Sheet 2 July 1 1924.

G. H. FRASER PULVERI Z ING MILL 1918 I5 Sheets-Sheet Original Filed April 50 Fly. 4.

Patented duly l, lmfid,

GEORGE HOLT FRASER, F BROOKLYN, NEW YORK.

PULVIERIZING MILL.

Application filed April 30, 1918, Serial No. 231,599. Renewed September 25, 19%.

To all whom. it may concern:

Be it known that I, Gnonon Hour FRASER,

a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, United States of America, have invented certain new and useful Improvements in Pulverizing Mills,

being a continuation in part of my application Serial No. 858,797, filed August 27,

1914, forfeited and renewed December 18, 1916, bearing Serial No. 267,401, and which has eventuated into Patent No. 1,317,014, dated September 23, 1919, of which the following is a specification.

This invention relates to apparatus for pulverizing materials and for separating the fine material by means of a fluid current, and aims to provide certain improvements therein.- I

Heretofore it has been common to pulverize material by means of balls or rollers revolved within an annular die against the inner periphery of which they act centrifugally to crush the material, the fine par- 26 ticles being carried out by an air current and coarse particles being intercepted by a screen surrounding the crushing chamber.

The present invention relates especially to pulverizers utilizing some of these princi- 30 pics of operation, and aims to provide improvements in pulverizers generally but especially applicable to those of this general type.

To this endin carrying out the preferred form of my present improvements I provide a casing, pulverizing elements comprising either a revolving or stationary die disposed either vertically or horizontally in the latter, rotatable balls or rolls movably carried, which if the die revolves will be carried by non-rotative movable carriers, and if the die is stationary will be carried by revolving carriers or pushers, and in either case there will be an aperture of our rent inlet centrally of the rock pan or crushing, chamber below or inwardly of the die, and a web above, leaving a passage between W for the returning air, which will jet through this passage toward the die, blowing the material into the latter and the fines upwardly and out, and I provide one or more sets ofannular troughs in the path of the air current and above the crushing elements so that this current may flow out between the annular troughs of the primary set and preferably also a secondary selecting set, which troughs afi'ord downward outlets through which large particles extracted by them may fall back into the pan, and afiord sinuous current passages through which the current may flow outwardly to float out, material fine" enough to be carried through these passages, and I provide an outer current passage descending outside of said troughs, and a lower separating chamber for as receiving the dust laden air current therefrom and separating its dust, and I provide extracting means for intercepting "or filtering floating particles from the air current returning to the pulverizing chamber so that it may be clean and continuously reused, and I provide a rotary fan, preferably an outside blower exerting the suction within the filter so as to produce a pressure vacuum or rarefaction in the outer part of the casing surrounding said parts, to draw the fine material upward by suction and lift it out of the die by the blast,

so that the outermost chamber surrounding said elements has a partial vacuum for insuring a more even and moderate current flowing through the various passages and avoiding danger of out-blowing dust, and to produce a tendency for the dust and air to enter rather than escape from the periph: cry of the casing; and I provide certain other features of improvement all of which will be more fully hereinafter set forth with reference to the accompanying drawings; in which, Fig. 1' is a vertical axial section showing the preferred form of my invention as applied to a pulverizer having a die fixed in a horizontal plane and an outside blowery Fig. 2 is a horizontal section thereof cut as on the planes of the lines 2-2 in Fig. l, and Fig. 3 is a horizontal section thereof cut on the planes of the lines 3-3 of Fig. l. Fig. 4' is a vertical axial section showing a modified form of my inventionhavin an me inside blower separably coupled to-a s ft differentially driven through the main shaft for slow speed and separably coupled to an inside motor for higher speed.

Referring to the drawingslet A indicate the main frame or casing of a pulverlze'r,

' B the inlet thereof, C the outlet thereof, D

the crushing chamber thereof, E the fine chamber thereof, F the fan or blower thereof, and G the driving means thereof.

These parts may be of any suitable construction or disposition sufficing to pulverize the material, to generate the necessary current to float out the fine product and dis- 'charge"the latter. As shown the frame or casing comprises a base'I-I which is preferably a hollow annular or cup shaped .casting adapted to rest on a support and to support or carry the other'parts of the apparatus, a top frame I, an upper shell J, and a lower shell K, which parts enclose the crushing chamber D, crushing elements C and finechamber E. l

The .crushing elements shown comprise movable and revolving rolls L within and acting outwardly toward the inner crushing face of a fixed die M removably mounted in. the base H.

The driving mechanism shown comprises a revolving carrier N connected by a shaft 0 with suitable driving gear as the belt pulley G for example. The fine chamber E is shown as an annular chamber below and surrounding the feed chamber and communicating therewith through an annular outer or egress passage loosely mounted or removable annular superposed reversely inclined baflles or members a and b spaced apart to afford between them sinuous outwardly extending current passages c and having lower outlets d affording downward material outlets for large particles precipitated'between them which serve to cause lifted material to descend in an annular path or blanket across the outflowing current so that this may extract fine material therefrom while coarse material will beint'ercepted and descend, which outlets communicate with the crushing chamher for returning such particles to the crushing elements, while the current passages communicate with the egress passage for discharging outflowing current thereto. These bafiies prevent large pieces passing to the fine chamber, permitting free'flow of current, and are not subject to the danger of puncture, clogging or wear, incident to screens. They are dis osed to avoid a direct path for the outlet 0 lar e pieces projecting from any direction an to intercept and return these for crushing, and serve to regulate the'fineness of discharge to that which can float through the passages between them.

c and select therefrom large particles which descend through the outlets h, which communicate with and return them to the crushing chamber. This secondary or selecting element S affords assurance that no material too large to float through it shall reach the fine chamber.

According to another feature of improvement I preferably provide extracting means T between the fine chamber and the return conduit and the ingress passage Q, for intercepting fine material floating in the return current. Preferably this is accomplished by providing two serles of hollow troughs i spaced apart and affording two annular foraminous walls one within the other for the inner side of the fine chamber, which troughs afford sinuous passages j between them for the inflowing current from the chamber and are staggered so that the concave side (if the inner troughs will be opposite the space between the outer troughs. These troughs extend vertically, and are preferably slightly inclined toward the approaching current at their lower parts, affording vertically elongated current passages between their edges, and affordin vertically elongated air passages or dea spaces opposite their concavities in which fine particles may'settle so that these can slide down their outer faces and be precipitated in the fine chamber. The return passage from the fine chamber is preferably an annular inwardly extending and contracting passage the bottom of which is afforded by an outwardly inclined ring or cone is below and spaced apart from the bottom wall Z of the crushing chamber to afford a horizontally inwardly extending annular space or conduit m under this, through which the return current flows from the fine chamber inwardly to again reach the crushing cham ber, and between which and the latter the return current passage is preferably closed from communication with the fine chamber, receiving return current from the filter and delivering it through the ingress assa e Q, to the crushing chamber, either irectIy if the current generating means is directly of the main casing and connected therewith by closed suction and exhaust passages constituting with the blower itself a part of the endless current passage of the pulverizer. This is preferably accomplished by mounting the blower F under and at the side of the main casing and connecting its suction pipe 01 with the passage m through the medium of an annular equalizin chamber U from which the suction pipe leads tangentially so that the exhausting current will be whirled centrifugally to insure a uniform suction all around the passage m; and by connecting the blast pipe 0 to the blower with a blast or pressure chamber V into the cylindrical wall of which it discharges tangentially to insure centrifugal whirling of the current around the inner wall of the blast chamber so that the pressure will equalize therein and flow equally upward below the lower edge of this wall through the central opening 9 therein and rise through the chamber 1" within the cones p and s to the ingress passage Q. l prefer to regulate the current by a butterfly valve t, and

to drive the blower and crushing elements with relative adjustability simultaneously from the main drive shaft a of the apparatus so that these elements will operate reciprocally and in unison to provide for variations in speed or conditions regardless of their independent adjustment from time to time.

. When the blower is placed within the main casing it will preferably operate on a vertical axis, being mounted in the chamher 1, and beinga barrel blower having a closed upper head and an annular open bottom suction communicating with the passage g to receive current therefrom and blow it into the chamber from which it will rise to the passage Q. In such case it will be driven by a motor below, or by a shaft rising to or through the shaft 0 and driven by a separate gear from the top gear thereof with an intermediate idler to multiply blower speed, as seen in Fig. 4.

According to another feature of improvement the lower part of'the casing is cut away, recessed, divided, or bifurcated, and affords separate outlets C and an intermediate way or passage W for access to or removal of the internal parts, through which the conduits 'n and 0 pass and in which the blower F may be mounted, and as shown the lower caslng K comprises a cylindrical outer wall a suspended from the under side of the base H, and carrying a plurality of flat segments or bottoms e which meet at their edges and afford removable bottom plates for I the chamber E, and through which the separate outlets C open for discharging dust into a transverse diametrically extending conveyor W which "con? verges their product, and the cylindrical wall to of the suction and blast chambers U and V, and the bottom conical wall a" of the latter, are disposed in the space between these outlets G below bottoms o and accessible therein, and the removable door or bottom 3 comprising a removably mounted reverse cone closing the bottom of the cone 00, and all these parts are separably suspended from the base and from each other by bolts 2.

According to another feature of improvement the feed inlet B comprises an annular hopper discharging centrally of the feed chamber, and a centrifugal feeder X is provided which is removably and adjustably' mounted on the carrier N and throws the material over the rolls on to an annular shelf or feeder Y surrounding the ring so that there may rest on this a mass of material to receive the impact of new feed and thus prevent wear and the material may fall by gravity annularly of the face of the ring in front of the approaching rolls.

According to another feature of improvement the rolls are pivotally or swingingly mounted on the carrier by swinging members Z and each pivoted to the carrier and each carrying a roll so that the latter can swing in and out as it works. Preferably the carrier has arms a having pivotal sockets 6 (shown in dotted lines in Fig. 1) in which removably drop pins 0 on the links Z which rest on top of the arms and have downwardly extending parts which pass in front of and beneath the rolls and have upwardly extending tubular pins 6 receiving bearing studs 7 on the rolls for rotatively carrying the latter. The-front edge g of each link preferably serves as a plow or lifter for scraping material from the bottom of the rock pan h and throwing it up on the inner face of the ring in front of the approaching roll and thusany roll may be lifted off and any link may be lifted out without disturbing other parts after the top has been opened, as the. feeder X and carrier N are proportioned to afi'ord clearance for ingress or egress of the convex face of the roll passing the concave face of the ring. Between the arms a the carrier has roll sockets i and its lowe side is concave and provided with a lip j between which andthe upturned 11p 70 of the base is afforded an annular part Z of the ingress passage Q,

My invention preferably alsoproyides for supplementing centrifuga force as a crushing'element by applyin outward. ressure to-the crushing rolls and utilizing t e reaction of one roll against another, which is preferably done by pressing means m intermediate of the members Z, acting outwardly toward these and movable radially thereof to equalize the stress between them and transmit the thrust of one to another. This may be accomplished -in any suitable way, but I prefer to use two loose radially and axlally movable rings n concentric of .otally engaging rockers" t on eac in the construction shown, and follow the movement of the rolls. 4

In operation with the construction set forth feed will enter annularly and be distributed above the crushing elements and below the selecting elements, affording its own wear cushion as it is deposited in an annular mass exteriorly of the crushing face,

and will fall slowly within the latter, so that only. material escaping crushing will de-i scend intothe pan and have to be plowed up therefrom by the auxiliary plows r on the under-side of the arms a. The outward air current will lift and blow fine material from the pan upwardly in front of the rolls, and will'lift ulverized material from the crushing cham erto within the selectors, in floating between which large particles will b'e-extracted and returned for crushin and material remaining in the current descend with it .to the fine chamber where it will precipitate and fall to the outlets, and

as the current returns from the fine cham-f vber particles still floating in it will be filtered out by and slide down the'filter tubes to extract all the fines-and return the current comparatively clean to the blower.- The concentric arrangement of passages, and centrifugal suction and discharge connections between these' and the blower will'equalizewill afford; ararefaction in the former com-- current pressures peripherally of the arts, and the connection of the suction si e of the blower with the outer chambers and the 'blast' side with the inner" chambers pared to the pressure in the latter which will tend to avoid escape of dust;

The several rolls can be/removed individually, their swinging links can be removed separately, but tlresei'and the carrier which is rcmovably mouhted ca'n be remoyed together, thus exposing the base for 11ft out the ring after the top has beentaken o frame or casing, a plura 7 including and communicating t The lower casing and parts may be dropped from the base without disturbing the superstructure, or either the outer or inner of these may be separately removed.

Pressure will be transmitted from one roll to the others, and the pressure exerted b these can beadjusted or initially set at su ficient degree to effect crushing without requiring such speed as would be requisite to do this by centrifugal force. Pressure will be equalized between the rolls and thus will be transmitted from one to another, thus relieving the driving parts and fixed bearings .from strain and utilizing the internal force stances, or the judgment 0 those skilled in the art, may dictate, without departing from the spirit of the invention.

What I claim is: v

1. In'combination, a pulverizer, a main ity of annular deflectors within said casing, means exhausting air from said casing outwardly of said deflectors, means filterm such air, and means returning the air lnwardl of said pulverizer into said casing inward y of said deflector.

ing an annular die having an internal crushing fape, one'or more pulverizin rolls cooperatlng with said die, means or revolving one of said arts, an annular assa inwardly of said die communicatingt roug the latter, an annular passage outwardly of said die, a foraminous wall, and means causing a fluid current to travel throu h said die within said foraminous wall, t rou h the latter, and descend exteriorly of sa1d die, and return beneath and through the central part of said die.

'3, In combination, a casing enclosing an outer fine chamber, an inner receptacle withinsaid casing aflordin a, crushing chamber and having upperand lower 0 enings respectively above and below it an communicating with said outer chamber, crushing elements in said crushing chamber, means affording an endless current passage connecting said upper and lower 0 enin and roug said chambers, and means for causing a fluid current to flow through said passage disposed therein to. produce a rarefaction in said outer chamber and a pressure in said inner chamben. v

2. lgn combination, a pulverizer compris- Mannie 4. In combination, a casing enclosing an outer fine chamber, an inner" receptacle withing said casing affording a crushing chamber and having upper and lower openings communicating with said outer chamber, crushing elements in said crushing chamber, means affording anendless current passage communicating throughsaid chambers,

. means for causing a fluid current to flow through said passage, and reversely inclined baflies in the path of such current affording sinuous current passages and precipitate outlets below an intermediate portion of such passages.

5. In combination, a casing enclosing an outer fine chamber, an inner receptacle within said casing affording a crushing chamber and having upper and lower openings communicating with said outer chamber, crushing elements in said crushing chamber, means aflording an endless current passage communicating throu h said chambers, means for causing a uid current to flow through said passage,and filtering means in the path of such current for extracting floating particles therefrom.

6. In combination, a casing enclosing an outer fine chamb r, an inner receptacle within said casing a ording a crushing chamber and having upper and lower openings communicating with said outer chamber, crushing elements in said crushing chamber, means aflording an endless current passage communicating through said chambers, means for causing a fluid current to flow through said passage, means affording a foraminous wall between said upper opening and said outer chamber for intercepting lar e particles moving toward the latter, an filtering means between said outer chamber and said lower opening for intercepting fine particles floating in such current toward the latter.

7..In combination, a casing enclosing an outer suction chamber, an inner receptacle affording a crushing chamber and having upper and lower openings communicating with said suction chamber, crushing ele ments in said. crushing chamber, means affording an endless current, passage com municatlng through and between 'said chambers comprising a tangential suction conduit commumcating wlth sa1d suctlon chamber,

an annular ,blast chamber communicating with said crushing chamber, a tangential blast conduit communicating with said blast chamber,,and means for causing a fluid current to fiow through said passage.

8. In combination, a casing enclosing an outer chamber, an inner receptacle in said casing aflording a crushing chamber and having an upper opening communicating with said. outer chamber, crushing elements in said crushing chamber, an annular revolving feeder below said upper opening and above said crushing elements for feeding material to be crushed into said crushmg chamber, and means for causing a fluid current to How from said crushing chamber through'said opening and into said outer chamber.

9. In combination, a casing enclosing an outer chamber, an inner receptacle in said casing affording a crushing chamber and having an upper opening communicating with said outer chamber, crushing elements in said crushing chamber, an annular revolving feeder above said crushing elements for feeding material to be crushed into said crushing chamber, means affording an annular shelf below. said upper opening and around said elements for receiving such material from said feeder and feeding it to such elements, and means for causing a fluid current to flow from said crushing chamber through to said opening to said outer chamber.

10. In combination, a casing enclosing an outer chamber, an inner receptacle in said casing afl'ording a crushing chamber and having upper and lower openings communieating with said outer chamber, crushing elements in said inner chamber, and means below said crushing elements for causing a fluid current to flow through said crushing chamber and upper opening into said outer chamber and return through saidv lower opening.

11. In combination, a casing enclosing an outer chamber, an inner receptacle in said casing affording a crushing chamber and having upper and lower openings communicatin with said outer chamber, crushing elements' in said inner chamber, and means without said casing for causing a fluid current to flow through said crushing chamber and upper opening into said outer chamber and return through said lower opening.

12. In combination, a casing enclosing an outer chamber, an inner receptacle affording a crushing chamber having an upper opening communicating with sa1d outer chamber, crushing elements revolving in a horizontal lane within said crushing chamber, means or causing a fluid current to flow from said crushing cha'mber through said opening to said outer chamber, and means forintercepting large particles floating in such current comprising reversely inclined annularbaffles disposed in the path of such current above and inwardly of said elements affording a sinuous outward passage for such current I said chambers,

' affor said outer chamber, crushing elements in said crushing chamber, means for causing a fluid current to' flow from said crushing chamber and throu h said opening between said chambers, an means 1n the path'of such current for intercepting solid particles in such current comprising vertically extending faces in and across and extending below the path of such current afiording downward ways for conducting out of the zone of such current intercepted particles and affording intermediate of such ways and in the path of such current apertures afi'ordcrushing chamber, a crushing fine cham er,

and an endless passage communicating through said chambers, crushing elements in chamber.

said crushing chamber, and means below 1,49aa1c said crushing chamber, suction and blast chambers inwardly of said fine chamber and disposed within said recess, and means affording acontinuous passage through said chambers.

20. In combination, a casing afiordin a crushing chamber, a stationary annu ar .crushing die mounted in a horizontal plane therein, a plurality of movable androtatable crushing rolls within and eccentric of said die, a revoluble carrier for said rolls, revolving in a horizontal plane and means pivoted to said carrier on a. vertical'axis and swinghorizontally pivotally sustaining sa1d ro s from said carrier.

21. In combination, a casing affording a crushing chamber, a fine chamber, and an endless passage communicatin throughsaid chambers, crushing elements in said crushing chamber, a blower in said passage for causing a current therethrough, and means differentially driving said elements and said blower from a common source of power.

22. In combination, a horizontal annular die having an internal crushing face, a rotatablecrushing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said arts, a movable carrier on WhlCh sa1d ro 1s rosaid' crushin chamber and in said passa e tatably mounted, and means for holdindg between saif fine chamber and said 0111S%- sa1d roll toward sa1d d1e comprlslng yiel ing chamberfor receiving current from the lng means actm reversely dlvergently o utformer and extracting material floating in wardly against t e 1nner side of sa1d carrier. said current returning to said crushing 23. In combination, a horizontal annular die having an internal crushing face, a ro- 16. In combination, a casing afiording a tatable crushing roll within and eccentr c crushing chamber, afine chamber, and a. pasof sa1d d1e and having a peripheral crushsage communicatin between aid h be ing face reciprocal to the mner face of sa1d in combination wit a plurality of crushing d1e, means for revolvin one of sa1d parts, elements in said crushing chamber, m ans'a movable carrler on w 1ch sa1d roll is rointermediate of said elements for transmittatably mounted, and means for holding said tmg. the inner thrust of one to another, and roll toward sa1d d1e comprising a spring remeans affording a continuous passage acting axiall of said die and means 1nthrough said chambers intermediate of sa d ward y of an actlng outwardly. against sa d thrust means. carrier for transmitting the stress of sa1d 17. In combination, a casing affording a' spring to the latter. crushing chamber and a fine chamber, crush- 24. In combinatlon, an annular d1e having-'elements in said blower exterior of said casing, and mean roll within and eccentric of sa1d d e, and afi'ording an endless passa e through said having a peripheral crushing face rec1 rocal blower communicating wit said crushing to the inner ace of sa1d d1e, means or rechamberbelow and inwardly of said el volving one of said parts, a movable carrier ments and communicating with said fine on which said roll is rotatably mounted, and chamber. means for holding said rol1 toward sa1d die -18. In combination, a casing affording a comprising difi'erently acting springs ncrushing chamber and a fine chamber, crush war ly of said roll ,and means transmitt ng ing elements in' said crushing chamber, a the stress of both sa1d springs to sa1d earner. blower below said crushing chamber, and 25. In combinat1on, an annular d1e havmeans afl'ording acontinuous passage com- 111% an internal crushing face, a rotatable municating through said crushing and fine ro within and efccntrlc of sa1d d1e; and chambers and said blower. having a perlpheral crush ng face reclpro- 19. In combination, a casing affording a 'cal to the inner face of sa1d d1e, means for crushing .chamber and a fine chamber having revolving one of said parts, a movable cara central lower recess, crushing elements in rier on which said roll is mounted, and

crushing'chamber, a ing an internal crushing face, a rotatable l did lit!

arcane means for pressing said roll toward said die comprising a spring inwardly of said roll acting on said carrier to-press said roll outward y and means for moving said carrier inwardly to retire said roll.

26. In combination, an annular crushing die having an internal crushing face, movable and rotatable crushing rolls within and eccentric of said die and each having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of saidparts, movable carriers for said rolls respectively, a support for said carriers, and means intermedlate of said rolls acting against said carriers for transmitting the inward stress of one to another.

27. In combination, an annular crushing die having an internal crushing face, rotatable crushing rolls within and eccentric of said die, and each having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said parts, a

rotatable holder for said rolls, and means revolving with and movable relatively to said holder communicating between two of said rolls for transmitting the inward stress of one to another.

28. In combination, an annular crushing die having an internal crushing face, movable and rotatable crushing rolls within and eccentric of said die, each having a peripheral crushin face reciprocal to the inner face of said ie, means for revolving one of said parts, and means for pressi said rolls outwardly comprising reverse y acting springs intermediate of said rolls and a spring resisting said springs.

29. In combination, an annular crushing die havin an internal crushing face, a rotatable crusfiiing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said parts, movable means on which said roll is rotatably mounted, movable holding means for holding said roll toward the inner face of said die to resist a pressure therefrom, and sliding means on which said pressing means are mounted.

30. In combination, an annular crushing die having an internal crushing face, a rotatable crushin roll within and eccentric of said die andv aving a peripheral crushing face reciprocal to the inner face of said'die, means for revolving one of said parts, movable means on which said roll is rotatably mounted, oppositely inclined holding means tatable crushing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said parts, movable means on which said roll is rotata-bly mounted, oppositely inclined holding means for holding said roll outwardly toward the inner face of said die to resist a crushing pressure therefrom, sliding means on which said inclined means of movably mounted respectively, and a spring acting to press said sliding means toward one another.

32. In combination, an annular crushing die having an internal crushing face, a rotatable crushing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of sail die, means for revolving one of said parts, movable means on which said roll is rotatably mounted, horizontally acting verticall adjustable inclined holding means for hold ing said roll outwardly toward the inner face of said die to resist a crushing pressure therefrom, and vertical adjusting means for vertically adjusting said holdin means.

33. In combination, an annu ar crushing die having an internal crushing face, a r0- tatable crushing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said parts, rotative means on which said roll is rotatably mounted, pressing means for pressing said roll outwardly toward'the inner face of said die to resist a crushing pressure therefrom, a casing enclosing said parts, and means without said casing for adjusting said pressing means.

34. In combination, an annular crushing die having an internal crushing face, a rotatable crushing roll within and eccentric of said die and having a peripheral crushing face reciprocal to the inner face of said die, means for revolving one of said parts, rotative means on which said roll is rotatably mounted, pressing means for pressing said roll outwardly toward the inner face of said die to resist a crushin pressure therefrom, a casing enclosing said parts, and means concentric of said rotative means and without said casing. for ad usting said pressing means during rotation of said rotative means.

. 35. In combination, "an annular crushing die having'an internal crushing face, a plurality of movable and rotatable crushing rolls within and eccentric of said die and each having a peripheral crushin face reciprocal to the inner face of said ie, means for revolving one of said parts, movable means on which said rolls are rotatably mounted respectively, rocking links inter-; mediate of and acting on said movable means respectively to hold said rolls outwardly to resist a crushing pressure from signed my name in the presence of two subthe lnner face of said die and havln ad a'- scnblng w tnesses.

cent inner ends, a movable seat mexn er 1ntermediate of and sustaining the adjacent .G HOLT FRASER 5 inner ends of said links, and means for movg Witnesses:

in said seat. member to rock said links. EDMUND J. FENN,

n witness whereof, I have herenntb SIGVARD G. HELLEIN. 

